如何在 JavaScript 中向现有对象添加属性和方法?

javascriptweb developmentobject oriented programming更新于 2025/9/4 23:08:17

以下是在 JavaScript 中向现有对象添加属性和方法的代码 −

示例

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
<style>
   body {
      font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
   }
   .result {
      font-size: 20px;
      font-weight: 500;
      color: blueviolet;
   }
</style>
</head>
<body>
<h1>在 JavaScript 中向现有对象添加属性和方法</h1>
<div class="result"></div>
<button class="Btn">单击此处</button>
<h3>单击上面的按钮向学生对象添加属性和方法并显示
them</h3>
<script>
   let resEle = document.querySelector(".result");
   let BtnEle = document.querySelector(".Btn");
   let student = {
      };
      BtnEle.addEventListener("click", () => {
         student.name = 'Rohan Sharma';
         student.age = 16;
         student.place = 'Delhi';
         student.displayInfo = function(){
         return 'Name = '+this.name+' : Age = '+this.age+' : Place = '+this.place;
      }
      resEle.innerHTML += student.displayInfo();
   });
</script>
</body>
</html>